Maxwell M Taylor

US Patent:

20140237993, Aug 28, 2014

Filed:

Nov 16, 2011

Appl. No.:

14/350364

Inventors:

Maxwell Taylor - Manassas VA, US
Louis Nkouka - Waynesboro PA, US
Adam Myers - Hagerstown MD, US

Assignee:

Mack Trucks, Inc. - Greensboro NC

International Classification:

F01N 3/10

US Classification:

60274, 60320

Abstract:

A method is provided for controlling varnish build-up in a variable geometry turbine (VGT) of a diesel engine turbocharger. According to the method, it is determined whether an operation parameter is at a level established for initiating a varnish build-up control sequence. Upon determining that the operation parameter is at the established level, the varnish build-up control sequence is initiated. The sequence comprises increasing exhaust temperature upstream of the VGT to a first exhaust temperature, and changing an opening size of a VGT nozzle between a smaller and a larger opening size in association with increasing the exhaust temperature to the first exhaust temperature. A diesel engine arrangement is also provided.